Harold e



H. E. YARROW.

AIR VALVE FOR FURNACES USING LIQUID FUEL.

APPLICATION FILED OCT. 30.1917.

1 ,3 1 2,3? Patented Aug. 5, 1919.

- ing also allows a whirling motion to be imp,

parted to the air entering the furnace.

In the accompanying drawing which A shows an exampleofv a constructionaccord- UNITED STATES FFTQEQ HAROLD E. YARROWI, OF GLASGOW, SCOTLAND.

AIR-VALVE FOR FURNACES USING LIQUID FUEL.

To ll? whom it may concern:

-Be it known that I, HAROLD EDGAR Yannow, a subject of the King of GreatBritain, residing in Glasgow, Scotland, have invented a certain new anduseful Air-Valve for Furnaces Using Liquid Fuel, of which the followingis a specification. The invention relates to means for controlling theflow of air to a furnace burning liquid fuel and comprises a valve whichisadapted to control the supply ofair and atthe same time to act as asa'fetydeviceto prevent, in the case of a blow back or rlse of pressurein the furnace, the escape of air, '1

gas or steam into the stokehold. The construction of the valve and ofthe valve seating to the invention, Figure 1 is a front cle vation'andFigs. 2 and 3 sections on the lines 2---2 and3-3 respectively of Fig, 1.

The seating, or fixed part, A of the air valve is in the form of afrustum f a hollow cone; in the sides of the cone area numberof ports'orpassages B, which may be pro-. videdwith directing vanes'C 1n order toimshown in the fully open position by dot and dash lines in Fig. 2 andby full lines in the closed position. The construction is such that inthe closed position of the valve, ports G of the valve are opposite tothe bars D in the seating and bars H between the ports of the valve areopposite to the ports B of the seating, so that in this position the airsupply to the furnaces is entirely out ofi, and the air supply can becontrolled as required by moving the valve toward or away from theseating. v Th ports G may be provided with directing vanes I, in orderto impart a whirling motion to the air, or they may be clear passages.The plane end of the valve F is, preferably, lined with asbestos asshown at M.

The valve, F, is supported, in the example shown, on rollers K, but anysuitable means may b adopted to move th valve in the aroundSpecification of Letters Patent. 'Patgntgd A ,,.5 1919, Applicationfiled October 30, 1917. Serial No. 199,313.

direction of the common axis of the valve and seating.

In the event of a blow back or rise in pressure in the furnace, theblast of air, gas or steam striking the, plane end L of the valve Fcauses it to move rapidly into contact with the seating A, therebyclosing all ports and reventing any danger to the men in the sto ehold.

Having thus fully described the nature of my said invention and thebestmeans Iknow' v of y g the same intogpractical effect, 1 l

claim 1. Means for controlling the supply of air to a furnace burningliquid fuel comprising 1n combmation a fixed seating inthe form of afrustum of a hollow cone, a valve also i in the form-of a frustum of ahollow cone coaxial with the said seating and having'a plane end subjectto the pressure of the gaseswithin the furnace to automatically move thevalve in the direction of the common axis of the cones to closethe'valve upon a rise of pressure in the furnace.

2. Means for controlling the supply of air i j to a furnace burningliquid fuel comprising 7 in combination a fixed seating in the form inthe form of a frustum of a hollow cone coaxial with the said seating andhaving a plane end subjectto the pressure of the gases within thefurnace to automatically move the valve in the direction ofthe commonaxis of the cones to close the valve upon a 3. Means for controlling thesup ly f I so iof a frustum of a hollow cone, a valve also air to afurnace burning liquid fuel comprising in combination a fixed seating inthe form of a frustum of a hollow cone having ports and bars in itsinclined sides, a valve also in the form of a frustum of a hollow cone,a valve also in the form of a frustum of a cone coaxial with the saidseating and having ports and bars in its inclined sides adapted toregister with the bars in the seatin in the closed position of thevalve, said va ve. having a plane end subject to the pres sure of gaseswithin the furnace and caused by a rise of pressure in the furnace tocause the valve to automatically move into closed position.

4. Means for controlling the supply of air to a furnace burning liquidfuel comprising in combination a fixed seating in the form of a frustumof a hollow cone, directing vanes on the said seating, a valve also inthe form of a frustum of a hollow cone coaxial with the said seating andmeans carried by the valve and subject to the pressure of gases withinthe furnace to cause the valve to move automatically in the direction ofthe common axis of the cones and close the valve if a rise of pressureoccurs in the said furnace.

5. Means for controlling the supply of air to a furnace burning liquidfuel comprising in combination a fixed seating in the form of a frustumof a hollow cone, a valve also in the form of a frustum of a hollow coneWitnesses JAMES RITCHIE, SILVESTER LYTTON.

